Well done on the purchase...sorry to hear aboput the problem.
To me (bear in mind I'm no mechanic) it sounds like your drive shaft.
This means the problem could be at either end of the shaft (there are two CV joints on each shaft - not just one) or it could be in the wheel bearings. But I would go for the driveshaft. It should be a straightforward changeove provided you have a T25 (?) Torx driver......you may also be able to find a reco shaft rather than grab a new (read pricey) one.
Check the integrity of both the inner and outer boots while you are at it. And replace them and the clamps if you change out the driveshaft.
By the by, there's a US VW Van forum at vwvortex.com and a UK T4 forum (quite good) at http://vwt4.forumsplace.com/
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